Pouring process of stainless steel castings
In the production of the casting process of the machine bed castings, the principles of high temperature out of the furnace and low temperature pouring should be followed when pouring. Because raising the temperature of molten metal is beneficial to the complete melting of inclusions and the floating of molten slag, it is convenient for slag removal and degassing, and reduces the slag inclusion and pore defects of machine tool castings; lower pouring temperature is beneficial to reduce the molten metal The gas solubility, liquid shrinkage and the baking of the surface of the cavity by the high temperature molten metal can avoid defects such as pores, sand sticking and shrinkage holes. Therefore, on the premise of ensuring that the mold cavity is filled, a lower pouring temperature should be used as much as possible. The process of injecting molten metal from the ladle into the mold is called pouring. Improper pouring operation can cause defects in machine tool castings such as insufficient pouring, cold barriers, pores, shrinkage holes and slag inclusions, and cause personal injury.
Mainly include appearance quality, internal quality and use quality. Appearance quality refers to the surface roughness, surface defects, size deviation, shape deviation, and weight deviation of the casting; internal quality mainly refers to the chemical composition, physical properties, mechanical properties, metallographic structure of the casting and the holes, cracks, inclusions, and Segregation and other conditions; the quality of use refers to the durability of the casting under different conditions, including the performance of resistance to chilling and heat, fatigue, shock absorption, and process performance such as machinability and weldability.
The quality of castings has a great influence on the performance of mechanical products. For example, the dimensional stability of machine tool castings directly affects the accuracy and maintenance life of the machine tool; the size, accuracy and surface roughness of the impeller, casing and hydraulic parts of various pumps directly affect the pump and hydraulic system. Work efficiency, energy consumption and the development of cavitation, etc.; the strength and resistance to chilling and heat resistance of internal combustion engine cylinder blocks, cylinder heads, cylinder liners, piston rings, exhaust pipes, etc., directly affect the working life of the engine.
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